I don't think it's that they need 8 defensemen down there. It's more so that they want to call the best defenseman up to Detroit, but don't want to lose their best defenseman down in Grand Rapids. It's a big weekend for them, with three games in three nights in the middle of a big playoff push. They likely want to call up Hicketts or Hronek, which would be a significant loss to GR. It makes perfect sense to me. Let them play the three games this weekend, play Ouellet tomorrow night against the Leafs and call one of the most up for the game Monday night in Montreal or Tuesday night at home against the Pens.